Class
Article
College
Emma Eccles Jones College of Education and Human Services
Department
Special Education and Rehabilitation Department
Faculty Mentor
Talin Louder
Presentation Type
Oral Presentation
Abstract
PURPOSE: To evaluate for statistical association between lower extremity, multi-joint maximal isometric and eccentric strength and vertical ground reaction force (GRF) measures derived from the performance of the depth jump (DJ) and countermovement jump (CMJ).
METHOD: Twenty-five college aged students performed three effort DJs from a height of 0.3 meters and three maximal effort CMJs. For both the DJ and CMJ trials, 15 measures of jump performance were estimated from time-series GRF data acquired using a tri-axial force platform. Participants then completed assessments of maximal isometric strength (MIS; dominant leg) and maximal eccentric strength (MES). MIS and MES were assessed using a lower extremity multi-joint seated isokinetic eccentric machine that was customized to collect time-series force data from load cells positioned on each foot pedal. Using body mass normalized MIS and MES data, separate Pearson correlation matrices were constructed to evaluate for statistical association (α = .05) with DJ and CMJ measures.
RESULTS: MIS and MES are significantly correlated (p ≤ 0.05) with jump height, work, and power for DJ and CMJ. For CMJ, significant correlations were observed in the amortization force and peak force when compared to MIS and MES.
CONCLUSIONS: Isokinetic eccentric resistance training can promote rapid gains in strength with minimal time commitment, yet there is limited evidence regarding transfer to functional movement such as jumping. Results from this investigation suggest that JH may be just one of several CMJ and DJ performance metrics that may be improved through lower extremity multi-joint eccentric and isometric strength development.
Location
Logan, UT
Start Date
4-11-2023 1:30 PM
End Date
4-11-2023 2:30 PM
Included in
Maximal Isometric and Eccentric Strength are Associated With Depth and Countermovement Jump Performance
Logan, UT
PURPOSE: To evaluate for statistical association between lower extremity, multi-joint maximal isometric and eccentric strength and vertical ground reaction force (GRF) measures derived from the performance of the depth jump (DJ) and countermovement jump (CMJ).
METHOD: Twenty-five college aged students performed three effort DJs from a height of 0.3 meters and three maximal effort CMJs. For both the DJ and CMJ trials, 15 measures of jump performance were estimated from time-series GRF data acquired using a tri-axial force platform. Participants then completed assessments of maximal isometric strength (MIS; dominant leg) and maximal eccentric strength (MES). MIS and MES were assessed using a lower extremity multi-joint seated isokinetic eccentric machine that was customized to collect time-series force data from load cells positioned on each foot pedal. Using body mass normalized MIS and MES data, separate Pearson correlation matrices were constructed to evaluate for statistical association (α = .05) with DJ and CMJ measures.
RESULTS: MIS and MES are significantly correlated (p ≤ 0.05) with jump height, work, and power for DJ and CMJ. For CMJ, significant correlations were observed in the amortization force and peak force when compared to MIS and MES.
CONCLUSIONS: Isokinetic eccentric resistance training can promote rapid gains in strength with minimal time commitment, yet there is limited evidence regarding transfer to functional movement such as jumping. Results from this investigation suggest that JH may be just one of several CMJ and DJ performance metrics that may be improved through lower extremity multi-joint eccentric and isometric strength development.